This is the area where Ichigo and friends first arrived when they entered the Hueco Mundo.There are not many hollow here and if you do find any they're probably very weak.
This is where you will find the most hollows in hueco mundo. Here you can also find the Gillian and Adjuchas menos and maybe and Vasto Lorde menos. (It is where Ichigo and company fell into before they broke into Las Noches.